Below is a series of images shot using either the Canon
MP-E 65 mm f/2.8 or the Olympus OM Zuiko 20 mm f/2.0 setup. All images was taken with the lens set
to f:8.0 (not effective aperture). The Canon EX14MR was used as flash lighting
using E-TTL. All images were shot as RAW on a Canon EOS 10D and converted to
JPEG using FileViewer 1.3.2.11. The images below have been resized to 250
pixels wide.

1X with Canon MP-E 65 mm f/2.8

2X with Canon MP-E 65 mm f/2.8

3X with Canon MP-E 65 mm f/2.8

4X with Canon MP-E 65 mm f/2.8

5X with Canon MP-E 65 mm f/2.8

6X with Zuiko 20 mm f/2.0

8X with Zuiko 20 mm f/2.0

10X with Zuiko 20 mm f/2.0

18X with Zuiko 20 mm f/2.0

Below is a couple of larger examples of what is possible
using the Olympus OM Zuiko 20mm 2.0 macro lens

When I get time, I'll add 100% crops,
images shot at f:16, and images shot with the additional extension of the the
Kenko extension tube sets.